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Coating liquid, organic-inorganic hybrid cation exchange membrane and preparation method thereof

A technology of cation exchange membrane and coating liquid, applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology, etc., can solve the problems of membrane inhomogeneity, inorganic phase separation, poor experimental repeatability, etc., and achieve excellent mechanical properties. , The effect of excellent uniformity and high diffusion dialysis performance

Inactive Publication Date: 2012-09-12
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The organic-inorganic hybrid cation exchange membrane of the present invention overcomes the above-mentioned defects of the prior art, such as the lack of covalent bond crosslinking in the membrane, insufficient stability of the membrane, poor repeatability of the experiment, and more precipitation in the coating solution. It is easy to damage the health of operators, it is easy to cause organic-inorganic phase separation, the membrane is not uniform, and the application performance of the membrane in the field of diffusion dialysis is insufficient, etc.

Method used

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  • Coating liquid, organic-inorganic hybrid cation exchange membrane and preparation method thereof
  • Coating liquid, organic-inorganic hybrid cation exchange membrane and preparation method thereof

Examples

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preparation example Construction

[0039] (1) Preparation of polysilicon crosslinking agent:

[0040] In molar ratio, it is monomer A containing sodium benzenesulfonate group: monomer B containing alkoxy silicon group: solvent C: initiator D=1: (1-2.34): (38.5-87.7): ( 0.020-0.036), preferably, by molar ratio, it is monomer A containing sodium benzenesulfonate group: monomer B containing alkoxy silicon group: solvent C: initiator D=1: (1-1.5) : (46-58): (0.021-0.027) ratio relationship, monomer A, monomer B, solvent C and initiator D are mixed and reacted, and then 60-75% of solvent C is removed to prepare polysilicon Crosslinker solution. Wherein monomer A, monomer B, solvent C and initiator D have the definitions as above.

[0041] Wherein, the reaction temperature and reaction time of monomer A, monomer B, solvent C and initiator D are determined by conditions such as the selected monomer and initiator. For example, in the case that monomer A is sodium styrene sulfonate, the reaction can be carried out at...

Embodiment 1

[0052] Example 1: Preparation of hybrid cation exchange membrane based on polysilicon crosslinking agent with high sodium styrene sulfonate content

[0053] Preparation of raw materials: (1) Polyvinyl alcohol (PVA, Shanghai Sinopharm Chemical Reagent Co., Ltd., polymerization degree is 1750±50) detection of raw materials: in order to test the amount of residual solvent (water and ethanol, etc.) in the PVA raw material, first take 2g PVA samples were dried at 60°C until constant weight, and the calculated weight loss ratio was 5.7%; (2) PVA dissolution: Take 42.4g of PVA raw materials, soak them in 760mL water for one day, and then dissolve them at 8°C / h under stirring conditions. The heating rate is raised to about 102°C, and kept at 102°C for 2.5 hours (h), to obtain a uniform and transparent solution, which is cooled to about 60°C for later use, and the mass concentration of the solution is 5%; (3) azobisiso Recrystallization of butyronitrile (AIBN, produced by Shanghai Sino...

Embodiment 2

[0074] Example 2: Preparation of hybrid cation exchange membrane based on polysilicon crosslinking agent with low sodium styrene sulfonate content

[0075] The preparation process of raw material is with embodiment 1, then carries out the following steps:

[0076] (1) Preparation of polysilicon crosslinking agent: Add 385mL DMF to a round-bottomed flask equipped with a reflux condenser and a drying tube, add 12.36g of sodium styrene sulfonate under stirring conditions, continue stirring for 2 hours, and heat up to 70°C , add 33.2mL KH-570 and 0.175g AIBN in turn, react for 12h, then add 0.175g AIBN, continue to react for 12h, remove 255mL of solvent (DMF) by rotary evaporation, and obtain a polysilicon cross-linked polysilicon with a concentration of 0.26g / mL agent solution. In this example, the molar ratio is sodium styrene sulfonate:KH-570:DMF:AIBN=1:2.3:82.5:0.035.

[0077] (2) Preparation of coating solution: Take 76.9mL (20g) polysilicon crosslinking agent solution, add...

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Abstract

The invention discloses a coating liquid, an organic-inorganic hydrid cation exchange membrane and a preparation method thereof. The coating liquid comprises polyvinyl alcohol, water and a multi-silicon cross-linking agent, wherein the mass ratio of the multi-silicon cross-linking agent and the polyvinyl alcohol is (0.75-1.34):1. The multi-silicon cross-linking agent is prepared as the following process: a monomer A, a monomer B, a solvent C and an initiator D are mixed and reacted according to the molar ratio of monomer A containing a sodium benzene sulfonate group: monomer B containing an alkoxy silicon group: solvent C: initiator D = 1: (1-2.34): (38.5-87.7): (0.020-0.036). Then, 60-75% of the solvent C is removed to produce the multi-silicon cross-linking agent solution. The hybrid cation exchange membrane is obtained from the coating liquid of the invention. The membrane has the advantages of high crosslinking degree, homogeneous transparency, good mechanical property, high swelling resistance and thermostability, and can be applied to the field of alkali recovery.

Description

technical field [0001] The invention belongs to the field of membrane technology, and in particular relates to a coating solution for forming an organic-inorganic hybrid cation exchange membrane, and a method for preparing an organic-inorganic hybrid cation exchange membrane by using the coating solution through a sol-gel method Method and obtained organic-inorganic hybrid cation exchange membrane. Background technique [0002] "Journal of Membrane Science" (Journal of Membrane Science, 342 (2009) 221-226) reported that polyvinyl alcohol (PVA) was first sulfonated, then blended with sulfonated polyetheretherketone, and then heat-treated to obtain cation exchange membrane. The ion exchange capacity of the cation exchange membrane prepared by the method is relatively high, but there is no covalent bond crosslinking in the membrane, and the stability of the membrane is insufficient. [0003] "Journal of Membrane Science" (Journal of Membrane Science, 376 (2011) 233-240) repor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00B01D71/06
Inventor 徐铜文吴永会吴翠明
Owner UNIV OF SCI & TECH OF CHINA
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